Hot-air furnace.



PATENTED PEB. 5, 1907.

G. 2P. A. RBLL.

HOT AIR PURNACE. APPLIOTION FILED SEPT. 5, 1905. RENEWED DE01?. 1908.

2 SHEETS-SHEET 1.

1HE Nolems PETER: ca., wAsmNcroN. n. c.

` PATENTED FEB. 5, 1,907.

v C. P. A. RELIJ.V HOT AIR FURNAGE. nrLroA'rxox Hmm snp'r. s, 1905.Bmwnwn Dnc. 1v, 190e.v

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1HE Nunms furnis co.. WASHINGTON. n. c.

TINTTED STATES PATENT OFFICE.

CORNELIS F. A. RELL, OF INDEPENDENCE, MISSOURI, ASSIGNOR TO ROELLMANUFACTURING COMPANY, OF INDEPENDENCE, MISSOURI7 A CORPORATION OFMISSOURI.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented Feb. 5, 1907.

,To cti/. whom if? may concern:

Be it known that I, CORNELIS F. A. RELL, a citizen of the United States,residing at Independence, in the county of Jackson and State ofMissouri, have invented certain new and useful Improvements in IIct-AirFurnaces; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the saine.

In the furnace known as base-revertiblc draft I have designed certainnovel features of construction the purpose of which is to provide for aneflicient central baseraft for producing a high heat with increased.surface radiation and in which the construction is specially designedfor durability and convenience of assembling of the Iire-pot and itssupporting and` protecting air-chamber and hre-zone forming parts, andin the claims appended hereto I will point out the parts and combinationof parts which constitute my invention, in connection with theaccompanying drawings, in which- Figure 1 represents in vertical centralsection a hot-air furnace embodying my invention. Fig. 2 is a verticalsection of the firepot, the grate, and their supporting parts. Fig. 3 isa horizontal section taken on the line a l) of Fig. 1. Fig. 4 is a likesection taken on the line c d ofFig. 1.

lVithin an inclosing casing a cylindrical or ring casting 1 forms theash-pit base, has the usual door 2 for the base-draft, and on thisbase-ring is seated a ring-plate 3, which is formed with a sunkenbottom, on which the grate 4 is supported. and from which the ringwall 5'l lares upward. The horizontal part of this ring-plate overhangs thebase-casting and on its overhanging circular edge G is seated atrough-shaped casting 7, inverted so as to form a chamber S, which opensinto the sunken bottom of the ring-plate 3 and forms with it and withthe grate the vlire zone 9. Upon the apex of this trough-shaped castingis seated the base edge of a ring 10, which forms a frustum of a cone,and on its upper edge is supported laterally the 'lire-pot 11, the lowerend of which terminates on a plane with the open bottom of the invertedtrough.

The apex of the inverted-trough casting forms a shouldered seat 12 forthe upper conical ring, and this ring, the inner inclined wall 13 ofsaid trough-casting, and theIire-pot together form a chamber 14 aroundthe {ircpot for supplyingair to the -lire zone at the lower edge of thelire-pot. The lire-pot is supported upon the inner edge of the innerinclined wall of the inverted trough, and this edge is quite thick andhas perforations 15, through which air from the chamber 14 passes intothe fire zone, while spaces 16 may be formed around the upper side ofthe thick edge on which the fire-pot rests and beneath its edge, throughwhich air from the chamber 14 enters the side of the 'lire-pot, so thatthese two outlets for the air from the chamber can be used together, theone promoting combustion .in the 'Iire zone, the other promotingcombustion within and at the hase ofthe 'fire-pot. The spaces enteringthe fire-pot, however, may be dispensed with, leaving the perforationsopening into the 'lire zone. The air-inlet for the chamber 14 is byregister 17 at the front of the casing 1S, which incloses all the partsof the furnace, and the cold air circulating around this chamber andpassing into the lire zone serves to protect the lower edge of thetrough-wall 13,where the heat is greatest. As this wall 13 supports thelirepot, it is the more important to protect the edge of the wallonwhich the fire-pot is seated, and the perforations 15 are made aroundthis edge at the bottoni of the air-chamber.

The dome 19 is supported on the top edge of the 'fire-pot, forms thecombustion-chamber, has the feed-opening closed by a door 20, and hascommunication for direct draft with the smoke-pipe 21, which iscontrolled by a damper 22. From the inverted-trough casting, which formsthe 'lire zone, one or more, preferably a pair, of flue-forming pipes 28descend and open into a horizontal pipeforming flue 24, having the formof a horseshoe partially surrounding the base-casting and from whichthree flue-forming pipes 25 rise and open into a fluo-forming pipe 26,partially surrounding the dome and which by two short pipes 27communicate with a like pipe-forming flue 2S, which intersects thehorizontal branch 21 of the smoke-pipe between its exit and the damper22 therein. It is this construction of three horizontal pipe- IOOforming nues-24, 26, and 28, one above the other, having communicationwith each other and with the smoke-pipe, that provides the revertibledraft and the even distribution of the heat within the casing, because istill higher horizontal pipe 28, which intersects the smoke-pipe 2l, andit will be noted that the vertical pipes 25 are disposed equal distancesapart with the upper short flues 27 at equal distance on each side ofthe smolrepipe and all at equal distances from the center of thefire-pot. 29 are openings in the top of the inclosing case, whereby thehot air therefrom may be carried where wanted. rIhe fire-pot and itschamber-forming parts having no fastenings are quickly and convenientlyassembled. The single casting of trough shape by being inverted andseated upon the outer edge of the grate-supporting ring-plate forms thefire-Zone chamber, a support for the fire-pot, and a support for the conical -ring,which, with the fire-pot and the inner wall of the invertedtrough, forms the air-chamber around the fire-pot. This inverted-troughcasting forms the means of connecting the diving i'lues of therevertible. draft, and the coacting relation of this inverted trough andits connected elements gives economy in the construction and in theassembling of the parts and constitutes a feature of my invention.

It will be understood that the direct draft up through the grate is usedin starting the iire and creates a vacuum in the pipes to render therevertible draft effective, because when the damper is closed the draftis compelled to follow the longest way; but the damper being open thedraft will follow the shortest way, and hence only one draft at a timeis active.

While I have shown the fire-pot, the grate, and the fire zone connectedand forming parts assembled with revertible flue-pipe connections in ahot-air furnace, obviously these parts may be assembled in a stove orrange in the same relation.

I claiml. In a hot-air furnace, an inclosing casing, a grate, aring-plate supporting the grate, a trough-ring inverted upon thecircumference of said ring-plate and forming a fire-zone chamber, afire-pot seated upon the inner lower edge of said inverted trough, aconical plate seated upon the apex of said inverted trough and includingits inner Wall forming an air-chamber around the fire-pot, and re- Thelower pipe 24 revertible flue-pipes connected to' the outer Wall of saidinverted trough. Y

2. In a hot-air furnace, an inclosingj casing, a base, a grate, aring-plate having a sunken center support for the grate, a trough-ringinverted upon the circuirerence of said ring-plate and including thegrate forming a fire zone, a re-pot supported upon the inner lower edgeof said inverted ring-trough, depending pipes connected to the outerwall of said ring-trough, a base -pipe partially4 surrounding the baseand connecting the depending pipes, a plurality of flue-pipes connectingand rising from said base-pipe, and flue-pipes connecting said verticalpipes with the exitpipe.

3. In a hot-air furnace, an inclosing casing, a base, a grate, aring-plate, supporting the grate, a trough-ring inverted upon saidringplate and forming a fire-Zone chamber, a fire-pot seated upon theinner lower edge of said. inverted trough, a conical plate seated uponthe apex of said inverted trough and against the outer wall of thefire-pot and including the inner wall of said inverted trough forming anair-chamber around the :lire-pot, a flue-pipe partially surrounding thebase, revertible flue-pipes connecting the base-pipe and the outer wallof said inverted trough, a dome forming the combustion-chamber, a valvedexit-pipe connecting the crown of the dome, a flue-pipe artiallysurrounding the dome, a plurality o flue-pipes connecting the baseflue-pipe with the fiue-pipe around the dome, a iiuepipe partiallysurrounding the crown of the dome and intersecting the exitpipe, and-apipe connecting each end of said top flue-pipe with each side of theflue-pipe around the dome.

4. In a hot-air furnace including an inclosing casing, a grate,aring-plate supporting the grate, a trough-ring inverted upon thecircuinference of said ring-plate and forming a fire-Zone chamber, afire-pot seated upon the inner lower edge of said inverted trough, aconical plate seated upon the apex of said inverted trough and includingits inner wall having perforations around its inner lower edge formingan air-chamber around the firepot, and revertible flue-pipesdependingfrom the outer wall of said inverted trough.

5. In a hot-air furnace, including an inclosing casing, a grate, aring-plate supporting the grate, a trough-ring inverted upon thecircumference of said ring-plate and forming a fire-zone chamber, afire-pot seated upon the inner lower edge of said inverted troughring, aconical plate seated upon the apex of said inverted trough-ring andincluding its inner wall forming an air-chamber around the fire-pot,said trough-ring being provided with perforations in the base edge ofsaid inner wall opening into the hre zone and spaces at the seating ofthe fire-pot upon said wall edge opening into the iire-pot, and

IOO

revertible Hue-pipes depending from the outer wall of said invertedtrough-ring.

6. In a hot-air furnace, an inclosing casing, a grate, a irepot, aninverted ring-trough surrounding the base of the iire-pot and includingthe grate forming the fire zone, revertible flue-pipes depending fromthe outer wall of said inverted ring-trough, a base flue-pipe connectingthe revertible flue-pipes, a deine forming the combustion-chamber, asmoke-pipe connecting the donie and having a direct-draft-controllingdamper, and a plurality of vertical and horizontal vflue-pipesconnecting the base flue-pipe with the sniokepipe between thecontrolling-damper of the latter and the exit for the purpose stated.

7. In an air-heating furnace and including an inclosing casing, a grate,a ring-supporting plate therefor, an inverted ring-trough provided withan inward-projecting edge seated upon the circumference of saidring-plate and with it and the grate forming a iire zone, a fire-potsupported upon the inward-projecting edge or' the inverted trough, andrevertible flue-pipes depending from the outer wall of said invertedring-trough.

S. In an air-heat1ng furnace, an inclosing casing, a grate, aring-supporting plate therefor, an inverted trough-ring 'forming withsaid plate and the grate, the re Zone, a `lirepot supported upon aninner edge 0l the inverted trough, revertible flue-pipes depending fromthe outer wall ol said inverted trough, and a ring-plate seated on thetop ol Said trough and with its inner wall and outer wall 0l thelire-pot, forming an air-chamber, the bottoni ol said trough at itsinner end having perlorations opening into said chainber and into thelire zone and openings leading from said chamber into the iire-pot atits lower edge.

In testimony whereol'- I have signed niy naine to" this specification inthe presence ol two subscribing witnesses.

CORNELIS F. A. RELL.

Vitnesses:

W. S. LOAR, A. J. FLETCHER.

